Example sentences of "[not/n't] know for sure " in BNC.
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| 1 | The Trinidad crashed near Madrid , and to this day we still do not know for sure what happened . |
| 2 | Camilla 's sister , Annabelle Elliott , admitted that she does not know for sure whether there is any truth in rumours of a relationship with Prince Charles . |
| 3 | She thought that her father probably now earned more than £100,000 a year , but she did not know for sure because it was nine years since she had last visited him , four years since she had last received a Christmas card from him . |
| 4 | But even if we discover that vineyards vanished from south east England at a time when the climate was getting colder , we still do not know for sure why they disappeared . |
| 5 | Then , when price is low firms do not know for sure whether it was because someone cheated ( produced a larger than agreed output ) , or because demand was low . |
| 6 | What the precise purpose was of installing complex electronics in an old sailing vessel he did not know for sure , and Iain did not press him . |
| 7 | Ages recorded on death certificates ( and to a lesser extent on marriage certificates ) were not always accurate because the informant did not know for sure . |
| 8 | Exactly how it happened we still do not known for sure but you can find examples of the kind of organisms it produced in almost any patch of fresh water . |
| 9 | Whether we get linguistic ability from our genes , or by imitating others or just from general intelligence is not known for sure . |
| 10 | ‘ Do n't know for sure yet , but there wo n't be any European corporate jobs left after we centralise everything in Detroit . |
| 11 | As for Jessie herself , she had held her in her arms and reassured her that her Robbie would be all right , even though , from the scanty information given her by the nurse , she could n't know for sure if he would be . |
| 12 | I do n't know for sure that Ernest is going to emigrate . ’ |
| 13 | He wo n't know for sure whether it 's a success until the time comes to deal with the excess stock . |
| 14 | ‘ I do n't know for sure . |
| 15 | ‘ I do n't know for sure , girlie , but we 'll sort it all out in the end , just see if we do n't . |
| 16 | WHETHER HEROIN is at the root of this unreliability I do n't know for sure , nor am I about to proscribe the freedom — or is that stupidity — of anyone to take whatever substance they choose to take , be it alcohol , tobacco , heroin or carpet cleaner . |
| 17 | We do n't know for sure . |
| 18 | Yes , probably , but I do n't know for sure . |
| 19 | On the Dipper , if you had your eyes shut and your ears plugged up — so you could n't see or hear what was going on — and you just thought about how heavy or light you felt , and what was happening to your tummy — you would n't know for sure what was happening . |
| 20 | ‘ I do n't know for sure where she goes , ’ he admitted to Wayne . |
| 21 | ‘ In fact , it may not turn out to be a job at all , but without you we could n't know for sure . ’ |
| 22 | ‘ You do n't know for sure that this is why the agency was raided . |
| 23 | ‘ We do n't know for sure that it 'll strike , ’ said Duvall . |
| 24 | She still did n't know for sure if Chris had been murdered . |
| 25 | ‘ Of course I do n't know for sure . |
| 26 | It seems likely she did , but we do n't know for sure . |
| 27 | ‘ Listen , Rod , we do n't know for sure . |
| 28 | But I do n't know for sure . ’ |
| 29 | If you do n't know for sure which type of drive you have check the ribbon cable running into it . |
| 30 | FitzAlan might suspect that something had happened between them , but he did n't know for sure . |